Add a utility function to translate coordinates relative to one widget's

Add a utility function to translate coordinates relative to one widget's

Tue Oct 16 15:50:03 2001  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkwidget.c (gtk_widget_translate_coordinates): Add
	a utility function to translate coordinates relative to
	one widget's allocation to coordinates relative to another
	widget's allocation.

	* gtk/gtkradiobutton.c: Add a special ->focus() implementation
	that:
	 - only accepts external focus if there is no active
   	   member of the group or the button is active.
	 - makes arrow keys move the active button as well
	   as the focus
	 - make tab tab out directly.
	This makes a radio button group act as a single focus location.
	(#53577).

	* gtk/gtkcontainer.c (gtk_container_focus): Remove prefiltering -
	it was only a small optimization that didn't matter and made
	things more complicated.

	* gtk/gtkcontainer.c (gtk_container_focus_tab): Get rid of custom
	sorter for FOCUS_TAB as we did for the other focus directions,
	sort by center of widgets, not upper-left corner. (Shouldn't
	matter in general.)

	* gtk/gtkcontainer.c: Restructure code to remove duplicate code
	from the different types of focusing: encapsulate sorting the
	widgets for the focus direction into one routine
	(gtk_container_focus_sort()) and then share the work of moving the
	focus between the different focus directions.

	* gtk/gtkcontainer.c: Fix bug where arrow navigation might not
	work correctly with focus chains containing non-immediate
	children. Sorting was being done using allocation coordinates for
	each widget in the focus chain, and if there were intermediate
	window-widgets, these allocations would not be in the same
	coordinate system.